So what about Long Beach? Is it the largest suburb? (Not counting St. Paul and Ft. Worth obviously)
Correct me if I'm wrong, but I think Long Beach might be the largest city that isn't a county seat.
Mesa, AZ will likely overtake Long Beach by the end of the decade. Kansas City, MO which is just behind Long Beach is not the county seat of Jackson County. Virginia Beach, VA is just behind Kansas City, and is not unambiguously a county seat. Three cities with over 300.000 persons which are not county seats are Arlington, TX; Autora, CO; and Anaheim, CA. St. Louis, MO also has over 300,000 for now.
Cities that have their own county (Philly, StL, Va. Beach, etc.), shouldn't really count as not being a county seat.
That leaves...
Long Beach, CA
Kansas City, MO (though Wiki says it's pretty much a second county seat)
Mesa, AZ
Arlington, TX
Aurora, CO
Anaheim, CA
Only Kansas City is the largest city in its county. For some reason, its election results report individually from the county.
If KCM doesn't count, what would be the largest city that's their county's largest city that is not a county seat?
